Reopen last project command line option conflicts with the new connect to kernel one

[Social-Mean]

Hi @ccordoba12 , I finally find the reason why I cannot connect to existing kernel in #23444.
Briefly, the function of the project plugin to open the previous project conflicts with the function of ipythonconsole plugin to connect to the kernel.

---

In #23444 (comment), I described the process of failing to connect to the kernel. But it's not detailed.

Detailed process

1. Following the dev guide to config the spyder-dev conda environment.
2. Start Spyder from source.

   python bootstrap.py
   

3. Open a project (through menu bar).
4. Close Spyder.
5. Start Spyder with --connect-to-kernel kernel-*.json option.

   (spyder-dev) $ python bootstrap.py -- --connect-to-kernel=kernel-12345.json
   

The result: Spyder connects to kernel-12345 indeed. But then Spyder window flashes and a new kernel is created.

Reason

Spyder will reopen last project when start.

spyder/spyder/plugins/projects/plugin.py

Lines 289 to 306 in 1e20d17

	def on_mainwindow_visible(self):
	# Open project passed on the command line or reopen last one.
	cli_options = self.get_command_line_options()
	initial_cwd = self._main.get_initial_working_directory()
	if cli_options.project is not None:
	logger.debug('Opening project from the command line')
	project = osp.normpath(
	osp.join(initial_cwd, cli_options.project)
	)
	self.open_project(
	project,
	workdir=cli_options.working_directory
	)
	else:
	self.get_widget().set_pane_empty()
	logger.debug('Reopening project from last session')
	self.get_widget().reopen_last_project()

The method reopen_last_project will flash Spyder.

Fix

I have fixed this bug on my computer. I will open a pull request later.

[ccordoba12]

Ok, thanks for finding the problem and proposing a solution @Social-Mean!